Whenever I go home, my parents treat me like a teenager again - how can I stop this from happening?

A lot of parents do tend to still parent like you haven't aged but the best way to help stop them from doing that is by showing them you are an adult who can look after yourself. By showing them you're mature it will be harder for them to nit pick at you.

Well, that's extremely hard because that's how they are used to perceiving you and behaving around you. The best way would be to, if it is really troubling you, go to group therapy. There are certain things that they think and feel which is the rout cause for their behavior such as perceiving you as clumsy, innocent, not capable of preforming certain actions etc. But you must talk to them and try to understand them and show them that you would like that they treat you a bit differently and that you will respond better to such treatment.

Talk to your parents about it. Express the way you feel. That way, they will understand you perfectly from your own point of view.

That must be really frustrating! I wonder how often you're in contact with them? Perhaps they are not seeing everything you are now capable of, and not really understanding that your interests and needs are different from what they were when you still lived with them. Perhaps if you get in touch more frequently and keep them updated, they'll have a better understanding of the wonderful adult you've become.

I think the best thing to do is talk to them. Show them that you're older and more responsible and discuss what is making you feel that way. A great way to do this is talk about boundaries.

You can stop this by showing them that you can provide for yourself! For example, getting a job, paying bills, chores etc.

you need to simply explain to them, and try to show them that you aren't 16 anymore, give them a couple of examples why, make it visible that you do not enjoy the way you are being treated. but do it respectfully

You probably cant depending on your parents. You are their child and always will be. Just remind them you are an adult and take care of your own responsibilities. If you are leaning on them for to much support then you are setting yourself up to be treated like a teenager. If that doesn't apply, then maybe they are the way they are and except them for them, or don't.

parents, while well-meaning, can often infantalize their kids. If you think its right, you can sit your parents down and have a serious conversation with them and let them know that as an adult, you feel like you should be considered as such.

Talk to them tell them how you feel sometimes parents don't realize what there doing and how it makes you feel so talk to them and also it will show them that your mature if you talk about how you feel